mirror of https://github.com/rust-lang/rust
29 lines
1.2 KiB
Plaintext
29 lines
1.2 KiB
Plaintext
error[E0631]: type mismatch in function arguments
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--> $DIR/suggest-option-asderef-inference-var.rs:7:56
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LL | fn deref_int(a: &i32) -> i32 {
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| ---------------------------- found signature defined here
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...
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LL | let _has_inference_vars: Option<i32> = Some(0).map(deref_int);
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| --- ^^^^^^^^^ expected due to this
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| |
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| required by a bound introduced by this call
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= note: expected function signature `fn({integer}) -> _`
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found function signature `fn(&i32) -> _`
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note: required by a bound in `Option::<T>::map`
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--> $SRC_DIR/core/src/option.rs:LL:COL
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help: consider wrapping the function in a closure
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LL | let _has_inference_vars: Option<i32> = Some(0).map(|a| deref_int(&a));
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| +++ ++++
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help: consider adjusting the signature so it does not borrow its argument
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LL - fn deref_int(a: &i32) -> i32 {
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LL + fn deref_int(a: i32) -> i32 {
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0631`.
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